Alligation Class : Alligation Class By Mr.Suresh Folks, in this session I am going to discuss about Alligation, a technique which helps us to quickly solve questions from topics like Mixtures, Averages, Time and Work, Time and
Distance, Simple Interest and Compound Interest.
Slide 2 : Let us start with a simple problem from mixtures. One pound of peanuts is added to a bin containing only cashews, and
the resulting mixture is 20% peanuts by weight. How many pounds of
Cashew is present in the bin?
Slide 3 : Yes, I accept that the previous question is a
sitter which can be done very fast using simple logic Since the final mixture is 20% peanuts and it is given
that it is 1 pound remaining 80% is Cashew and
obviously it must be 4 pounds. Fine, I accept this. Can you answer the following question quickly How many kgs of Rice costing 32.25$/kg must be mixed with
38.5 kgs of Rice costing 40$/kg so that the resulting mixture
is worth 35$/kg?
Slide 4 : Here is a quick solution
Slide 5 : Let's look at a little bit tougher question........... Two mixtures A and B contain milk and water in the ratio
2:5 and 5:4 respectively. How many gallons of A must be
mixed with 90 gallons of B so that the resultant mixture
contains 40% milk?
Slide 6 : A farmer has certain number of hens and cows. If the
total number of heads is 58 and total number of legs is
176, find the difference in the number of Hens and
Cows.
Slide 7 : So friends apply this to questions from
Profit & Loss, Simple Interest,
Compound Interest and other topics as well. For doubts clarification you can
reach me at
bsureshbala@gmail.com